湍流
光学
稳健性(进化)
物理
模式(计算机接口)
联轴节(管道)
模耦合
单模光纤
高斯分布
计算物理学
激光器
机械
材料科学
计算机科学
化学
量子力学
操作系统
基因
冶金
生物化学
出处
期刊:International Conference on Space Optics — ICSO 2020
日期:2021-06-11
卷期号:11852
摘要
Developing standard and accessible atmospheric turbulence mitigation is of paramount importance to enable laser communication network deployment. Multi-Plane Light Conversion (MPLC) [1]–[3] is proving to be an effective technique to improve coupling efficiency of a perturbated wave-front profile towards a single-mode fiber [4]–[6]. However, to date, experimental studies are restricted to a fixed number of modes. In this work, we numerically and experimentally study performance improvement of the MPLC technique and mode collection compared to direct single mode fiber coupling for several D/r0 ratio, D being the receiver aperture diameter and r0 the Fried parameter.
We calculate the coupling efficiency, represented in Fig 1. Collection for SMF only is shown in Fig 1-a while the summation of the 15 first Hermite-Gaussian modes is represented in Fig 1-b. Collection for each mode for D/r0=4 is displayed in Fig 1-c. We demonstrate that 15 modes MPLC appears to be a good compromise between number of modes and complexity of the device. This configuration typically improves the collection efficiency by >7 dB in the case of strong turbulence when D/r0 >4. More important, the minimum collection efficiency that would correspond to a link failure is dramatically increased compared to SMF fiber alone. MPLC thus shows high robustness to turbulence fluctuation.
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